<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>卡券效果</title>
  <style>
    body {
      background-color: gainsboro;
    }

    .coupon {
      width: 300px;
      height: 100px;
      line-height: 100px;
      margin: 50px auto;
      text-align: center;
      position: relative;
      background: radial-gradient(circle at right bottom, transparent 10px, #ffffff 0) top right /50% 51px no-repeat,
      radial-gradient(circle at left bottom, transparent 10px, #ffffff 0) top left / 50% 51px no-repeat,
      radial-gradient(circle at right top, transparent 10px, #ffffff 0) bottom right / 50% 51px no-repeat,
      radial-gradient(circle at left top, transparent 10px, #ffffff 0) bottom left / 50% 51px no-repeat;
      filter: drop-shadow(2px 2px 2px rgba(0, 0, 0, .2));
    }

    .coupon span {
      display: inline-block;
      vertical-align: middle;
      margin-right: 10px;
      color: red;
      font-size: 50px;
      font-weight: 400;
    }
  </style>
</head>

<body>
<p class="coupon">
  <span>200</span>优惠券
</p>

<p class="coupon">
  <span>200</span>优惠券
</p>

<p class="coupon">
  <span>200</span>优惠券
</p>
</body>

</html>
